The universe is literally everything, the sum of all existence. It includes all matter, like stars and galaxies. The universe also includes all radiation and all other forms of energy. No matter where ...

Assessing student learning effectively is often complicated by relying on ambiguous proxies such as grades, quiz scores, or assumptions about students' internal states, such as what they feel, think, ...

This video explores what scientists mean when they talk about the edge of the observable universe. Using real observations and established physics, it explains why space appears black beyond a certain ...